Dig deeper at SERNEC, a consortium of southeastern herbaria.
Spermatophytes (seed plants): Gymnosperms (non-flowering plants): Conifers: Cupressales
WEAKLEY'S FLORA (11/30/12):
Thuja occidentalis
FAMILY
Cupressaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Thuja occidentalis
FAMILY
Cupressaceae
SYNONYMOUS WITH
VASCULAR FLORA OF THE CAROLINAS (1968) 018-02-001:
Thuja occidentalis
FAMILY
Cupressaceae
COMMON NAME:
American Arborvitae, Eastern Arborvitae, Northern White Cedar, Flat Cedar
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JK Marlow jkm070629_002
June Spartanburg County SC
Hatcher Garden
Branchlets flattened in horizontal planes [T. orientalis's are vertical], per Weakley's Flora.
COMPARE
conifers (not including Pines)
JK Marlow jkm120830_299b
August Henderson County NC
Holmes Educational Forest
The small branchlets look as if they had been ironed or pressed, per Vascular Flora of the Carolinas.
JK Marlow jkm120830_299c
August Henderson County NC
Holmes Educational Forest
Leaves opposite, scale-like, in pairs (the side pairs keeled, others flat), per Native Trees of the Southeast, An Identification Guide.
JK Marlow jkm090924_204
September Hancock County ME
Acadia National Park
Mature seed cones ~ 1/2" long, oblong, erect, initially yellowish-brown, per Native Trees of the Southeast, An Identification Guide.